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ap431/ap431a adjustable precision shunt regulator ap431/ap431a rev. 1 1 of 13 august 2006 www.diodes.com ? diodes incorporated features ? precision reference voltage ap431 : 2.495v 1% ap431a : 2.495v 0.5% ? sink current capability: 200ma ? minimum cathode current for regulation: 300a ? equivalent full-range temp coefficient: 30 ppm/ o c ? fast turn-on response ? low dynamic output impedance: 0.2 ? ? programmable output voltage to 36v ? low output noise ? packages: to92-3l, sot89-3l, sop-8l, sot23, sot25, sc-59 ordering information description the ap431 and ap431a are 3-te rminal adjustable precision shunt regulators with guaranteed temperature stability over the applicable extended commercial temperature range. the output voltage may be set at any level greater than 2.495v (v ref ) up to 36v merely by selecting two external resistors that act as a voltage divider network. thes e devices have a typical output impedance of 0.2 ? . active output circuitry provides very sharp turn-on characteristics, maki ng these devices excellent improved replacements for zener diodes in many applications. the precise (+/-) 1% reference voltage tolerance of the ap431/ap431a make it possible in many applications to avoid the use of a variable resistor, consequently saving cost and eliminating drift and reliability problems associated with it. a p 4 3 1 x xxx package packing -7/-13 : taping blank : sop-8l sa : sot23 w:sc59 r:sc59 q:sot25 lead-free blank : standard l : lead-free g : green tolerance: blank : +/- 1% a : +/- 0.5% reference voltage (note1) -u : tube -b : bulk v : to92-3l y : sot89-3l -a : ammo box note: 1. only for sot23 and sc59 7? tape and reel 13? tape and reel ammo box device (note 2) package code packaging (note 3) quantity part number suffix quantity part number suffix quantity part number suffix ap431(a)sa sa sot23 3000/tape & reel -7 10000/tape & reel -13 na na ap431(a)q q sot25 3000/tape & reel -7 10000/tape & reel -13 na na ap431(a)w w sc59 3000/tape & reel -7 10000/tape & reel -13 na na ap431(a)r r sc59 3000/tape & reel -7 10000/tape & reel -13 na na ap431(a) sop-8l na na 2500/tape & reel -13 na na ap431(a)y y sot89-3l na na 2500/tape & reel -13 na na ap431(a)v v to92-3l na na na na 2000/box -a notes: 2. suffix ?a? denotes ap431a device. 3. pad layout as shown on diodes inc. suggested pad layo ut document ap02001, which c an be found on our website at http://www.diodes.com /datasheets/ap02001.pdf.
ap431/ap431a adjustable precision shunt regulator ap431/ap431a rev. 1 2 of 13 august 2006 www.diodes.com ? diodes incorporated typical application circuit typical application circuit ref (r) v ref + - anode (a) cathode (c) cathode (c) ref (r) anode (a) typical application circuit + + r2 r1 v out v in v out = (1+r1/r2)v ref precision regulator c in c out ap431
ap431/ap431a adjustable precision shunt regulator ap431/ap431a rev. 1 3 of 13 august 2006 www.diodes.com ? diodes incorporated pin configuration package pin configuration (top view ) sot 25 package 4ref 5 anode pin configuration (top view ) nc 1 cathode 3 nc 2 sc-59 (package code -r) anode 1 2ref 3 cathode sc-59 (package code -w) anode 1 3ref 2 cathode sop -8l sot 23 anode 1 2 cathode 3ref 1 ref 2 anode 3 cathode 1 ref 2 anode + + + 3 cathode to92-3l sot89-3l nc 5 4 18 6 7 3 2 anode anode cathode nc anode ref anode absolute maximum ratings cathode voltage ???????????......?..............................?????...?...............?..??????.??.??...???.36v continuous cathode current ??????????.??...............................????...........?????????.... -10ma ~ 250ma reference input current range ?????..???..............??...............................??........??????.??..???........ 10ma operating temperature range ????..??.??.....??????...........?..........??????.????......-20c ~ 85c lead temperature??????????.??..?.??.????....????????.............??????..?.?...?............ 260c storage temperature ???????????......?....?..........??????..?..........?.?...??????...??.... -65c ~ 150c power dissipation (notes 4, 5) sot23 package??????????????????????????????..?. 250mw sot25 package .????.....????????.....?....????????????...... 250mw sc59 package......................................................................??????....??........?. 400mw sop-8l package ?????..?????.......??????????????...?....?. 600mw sot89-3l package ................................................................ ???....??.. ......?. 800mw to92-3l package ??.????..?????.......????????????...?....?. 780mw note 4. t j , max =150c note 5. ratings apply to ambient temperature at 25c
ap431/ap431a adjustable precision shunt regulator ap431/ap431a rev. 1 4 of 13 august 2006 www.diodes.com ? diodes incorporated electrical characteristics ( t a = 25 o c, v + = +5.0v, unless otherwise stated ) parameter test conditions symbol min. typ. max. unit reference voltage v ka = v ref , i ka = 10ma (fig.1) ap431 ap431a v ref 2.470 2.482 2.495 2.520 2.507 v deviation of reference input voltage over temperature (note 6) v ka = v ref , i ka = 10ma, ta = full range (fig.1) v ref ? 8.0 20 mv v ka = 10v ~v ref ? v ref ? -1.4 -2.0 mv/v ratio of the change in reference voltage to the change in cathode voltage i ka = 10ma (fig.2) v ka = 36v ~10v ? v ka ? -1 -2 mv/v reference input current r1 = 10k ? ,r2 = i ka = 10ma (fig.2) i ref ? 1.4 3.5 a deviation of reference input current over temperature r1 = 10k ? ,r2 = i ka = 10ma ta = full range (fig.2) i ref ? 0.4 1.2 a minimum cathode current for regulation v ka = v ref (fig.1) i ka(min) ? 0.19 0.5 ma off-state current v ka = 36v, v ref = 0v (fig.3) i ka(off) ? 0.1 1.0 a dynamic output impedance (note 7) v ka = v ref v ka = v ref ? i ka = 0.1ma ~ 15ma frequency | z ka | ? 0.2 0.5 ? v max v min t i t 2 temperature v dev = v max - v min note: 6. deviation of reference input voltage, v dev , is defined as the maximum variation of the re ference over the full temperature range. the average temperature coefficient of the reference input voltage v ref is defined as: 1 2 6 ref dev ref t t 10 ) c) (25 v v ( v ? ? = ????????..??????.. ( ) c ppm where: t2 ? t1 = full temperature change. v ref can be positive or negative depending on whether the slope is positive or negative. note: 7. the dynamic output impedance, r z , is defined as: ka ka ka i v z ? ? = when the device is programmed with two external resistors r1 and r2 (see figure 2.), the dynamic output impedance of the overal l circuit, is defined as: ) r2 r1 (1 z i v z ka ' ka + ? ? =
ap431/ap431a adjustable precision shunt regulator ap431/ap431a rev. 1 5 of 13 august 2006 www.diodes.com ? diodes incorporated test circuits input v ref v ka i ka fig 1. test circuit for v ka = v ref in v ref r1 r2 i ref note:v ka =v ref (1+r1/r2)+i refx r1 i ka v ka fig 2. test circuit for v ka > v ref in v ka i z(off) fig 3. test circuit for off-state current
ap431/ap431a adjustable precision shunt regulator ap431/ap431a rev. 1 6 of 13 august 2006 www.diodes.com ? diodes incorporated typical performance characteristics cathode current vs cathode voltage -100 0 100 -1.5 -0.5 0.5 1.5 2.5 cathode voltage (v) cathode current (ma) v ka =v ref ta=25 o c cathode current (ua) vs cathode voltage -1 cathode voltage(v) cathode current (ua) -200 200 400 600 0 -0.5 0 0.5 1 1.5 2 2.5 v ka =v ref ta=25 o c reference voltage vs free-air temperature free-air temperature ( o c) reference voltage (mv) 2480 2485 2490 2495 2500 -40 80 -30 -20 -10 0 10 20 30 40 50 60 70 reference input current vs free temperature free-air temperature ( o c) reference input current (ua) 1 1.2 1.4 1.6 1.8 2 -50 -25 0 25 50 75 100 125 r1=10k i ka =10ma change in reference voltage vs cathode voltage 0 5 10 15 20 25 30 cathode voltage (v) change in reference voltage (mv) -12 -10 -8 -6 -4 -2 0 i ka =10ma ta=25 o c
ap431/ap431a adjustable precision shunt regulator ap431/ap431a rev. 1 7 of 13 august 2006 www.diodes.com ? diodes incorporated typical performance characteristics ( continued ) + - + - output gnd 15k ? 8.25k ? 9 f i ka 232 ? test circuit for voltage amplification small-signal voltage amplification vs frequency 0 10 20 30 40 50 60 1k 10k 100k 1m 10m f-frequency-hz a v -small signal voltage amplification (db) i ka =10ma t a =25 o c + - i ka gnd output 1k ? 50 ? test circuit for reference impedance reference impedance vs frequency 0.1 1 10 100 1k 10k 100k 1m 10m f-frequency-hz | zka | reference impedance ( ? ) i ka =10ma t =25 c a o
ap431/ap431a adjustable precision shunt regulator ap431/ap431a rev. 1 8 of 13 august 2006 www.diodes.com ? diodes incorporated typical performance characteristics ( continued ) pulse response 0 1 2 3 4 5 6 -101234567 t-time- s input and output voltage-v input output gnd output 220 ? 50 ? test circuit for pulse response pulse generator f=100khz t a =25 o c + - 150 ? i ka v batt c l test circuit for curve a + - c l r1=10k ? r2 i ka 150 ? v batt test circuit for curve b, c, and d the areas under the curves represent conditions that may cause the device to oscillate. for curves b, c, and d, r2 and v+ were adjusted to establish the initial v ka and i ka conditions with c l =0.v batt and c l were then adjusted to determine the ranges of stability. stability boundary conditions ? 0 10 20 30 40 50 60 70 80 90 100 0.001 0.01 0.1 1 10 c l -load capacitance- f i ka -cathode current-ma a v ka =v ref b v ka =5v c v ka =10v d v ka =15v a b c d stable stable ta=25 o c
ap431/ap431a adjustable precision shunt regulator ap431/ap431a rev. 1 9 of 13 august 2006 www.diodes.com ? diodes incorporated application examples v in + low limit v ref (1 + r1b/r2b) +v be high limit v ref (1 + r1a/r2a) r1a r1b r2a r2b v be output on when low limit < < high limit fig.10 over-voltage / under-voltage protection circuit v in r cl i out i out = v ref / r cl fig. 6 current limiter or current source i out v in i out = v ref / r s r s fig. 7 constant-current sink fig. 4 voltage monitor fig. 5 delay timer v out = (1 + r1/r2) x v ref v in r1 r2 fig. 8 higher-current shunt regulator v out v in puse r1 r2 l imit (1 + r1/r2) x v ref fig. 9 crow bar v out v in on off r + v in delay = rc x ln ( v in -v ref ) led on when low limit < v in high limit low limit v ref (1+r1b/r2b) high limit v ref (1+r1a/r2a) r1a r2a v in r1b r2b < v in
ap431/ap431a adjustable precision shunt regulator ap431/ap431a rev. 1 10 of 13 august 2006 www.diodes.com ? diodes incorporated package diagrams ( all dimensions in mm ) (1) sot25 (2) sc59 0.10/0.20 typ 0.15 0.013/0.10 typ 0.05 0.35/0.55 typ 0.40 typ 0.95 1.50/1.70 typ 1.60 2.70/3.00 typ 2.80 2.90/3.10 typ 3.00 1.00/1.30 typ 1.10 typ 0.55 top view 0.35/0.50 0.10/0.20 0.013/0.10 0.35/0.55 0.95 2.70/ 3.00 2.90/3.10 1.00/ 1.30 1.50/ 1.70 1.90 top view 0/8 (3) sot23 (4) sop-8l 0.37/0.51 0?8 0.45/0.60 0.013/ 0.10 0.45/0.61 top view 0.085/0.180 1.20/1.40 2.30/2.50 2.80/3.00 0.89/ 1.03 0.903/ 1.10 1.80/2.00 3.85/3.95 typ 3.90 3.80/3.90 typ 3.85 4 5 x 0.60/0.70 typ 0.65 0.15/0.25 typ 0.20 0 . 6 0 / 0 . 8 0 t y p 0 . 7 0 1.27 4.85/4.95 typ 4.90 1.40/1.50 typ 1.45 0.30/0.50 typ 0.40 5.90/6.10 typ 6.00 5 4 1 8 0.08/0.25 typ 0.15 r 0 . 1 ( a l l s i d e ) 9 4 3 0.35
ap431/ap431a adjustable precision shunt regulator ap431/ap431a rev. 1 11 of 13 august 2006 www.diodes.com ? diodes incorporated package diagrams ( continued ) ( all dimensions in mm ) (5) sot89-3l (6) to92-3l
ap431/ap431a adjustable precision shunt regulator ap431/ap431a rev. 1 12 of 13 august 2006 www.diodes.com ? diodes incorporated marking information (1) sot23/sot25/sc59 sot23/sot25/sc59 : (top view) blank : standard l : lead-free g : g reen xx ym x marking code d ate c ode lead-free y year m : month (a~l) (note1) note: 1. only for sot23 and sc59 (2) sop accuracy ap431 x yyww x blank: a: logo ( top view ) % 1 495 . 2 % 5 . 0 495 . 2 yy : year ww: nth week date code lead free blank: standard l: lead free package g: green (3) sot89-3l sot89-3l : (top view) blank : standard l : lead-free g : g reen xx ym x marking code d ate c ode lead-free y year m : month (a~l)
ap431/ap431a adjustable precision shunt regulator ap431/ap431a rev. 1 13 of 13 august 2006 www.diodes.com ? diodes incorporated marking information ( continued ) (4) to92-3l accuracy ap431 x yww x x blank: a : ( top view ) y : year ww: nth week date code internal code 1% 2.495 0.5% 2.495 blank: normal l: lead free package lead free marking code table device package(note 8) marking code date code ap431sa sot23 d1 ym ap431asa sot23 d2 ym ap431q sot25 a2 ym ap431aq sot25 a3 ym ap431w sc59 a6 ym ap431aw sc59 a7 ym ap431r sc59 a8 ym ap431ar sc59 a9 ym ap431y sot89-3l a4 ym ap431ay sot89-3l a5 ym notes: 8. for packaging details, go to our website at http://www.diodes.com/datasheets/ap02007.pdf . important notice diodes incorporated and its subsidiaries reserve the right to make modifications , enhancements, improvements, corrections or o ther changes without further notice to any product herein. di odes incorporated does not assume any liability ar ising out of the application or use of any p roduct described herein ; neither does it convey any license under its patent rights , nor the right s of others. the user of products in such applications shall assume all risks of such use and will agree to hold diodes incorporated and all the companies whose products are represented on our website , harmless against all da mages. life support diodes incorporated products are not authorized for use as critical components in life support devices or systems without the expressed written approval of the president of diodes incorporated.

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